WO2002078123A1 - A built-in, multi band, multi antenna system - Google Patents

A built-in, multi band, multi antenna system Download PDF

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Publication number
WO2002078123A1
WO2002078123A1 PCT/SE2002/000532 SE0200532W WO02078123A1 WO 2002078123 A1 WO2002078123 A1 WO 2002078123A1 SE 0200532 W SE0200532 W SE 0200532W WO 02078123 A1 WO02078123 A1 WO 02078123A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
antenna system
trace
band
parasitic element
Prior art date
Application number
PCT/SE2002/000532
Other languages
French (fr)
Inventor
Thomas Bolin
Zhinong Ying
Johan Andersson
André DA SILVA FRAZAO
Peter NORDENSTRÖM
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE0101067A external-priority patent/SE0101067D0/en
Priority claimed from SE0102183A external-priority patent/SE518988C2/en
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to EP02708888A priority Critical patent/EP1378021A1/en
Priority to US10/472,996 priority patent/US20040137950A1/en
Publication of WO2002078123A1 publication Critical patent/WO2002078123A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to mobile telephones and similar types of portable communication devices that need several commercial frequency bands to communicate on . More specifically, the invention relates to a built-in, multi band, multi antenna system for such mobile tele- phones, etc.
  • a basic problem of today is to be able to put one or several very small antennas on e.g. a mobile telephone. Main emphasis is put on size, but a good electrical performance is also important.
  • BluetoothTM applications have become a world standard, an additional frequency band must be covered in future mobile telephones . It is very- hard to include this in an already existing antenna, most commonly a built-in antenna.
  • Another way is to include a new antenna to handle BluetoothTM communication.
  • the available space is very small - in fact, too small in reality.
  • the antennas will often have to be located very close to each other, since generally, the best position is at the top of the telephone.
  • This kind of complicated internal antenna system needs a very sophisticated mechanical process, involving for example MID, metal painting and printed film. The designer must be very careful to get good isolation between the main antenna and the BluetoothTM antenna .
  • FIG 1 is a schematic perspective view of the antenna system
  • FIG 2 is schematic side view of the antenna system shown in FIG 1
  • FIG 3 is a schematic perspective view of a mobile telephone with an antenna carrier and an antenna connector for the antenna system of FIGs 1 and 2
  • FIG 4 corresponds to FIG 3, with the addition of the antenna system of FIGs 1 and 2 in an unfolded condition
  • FIG 5 shows the unfolded antenna system of FIG 4 together with the antenna connector mounted on a printed circuit board
  • FIG 6 is a return loss diagram for a main antenna and a BluetoothTM antenna, which are comprised in the antenna system,
  • FIG 7 illustrates the isolation between the two antennas of FIG 6,
  • FIG 8 is a dimensioned drawing of the presently preferred embodiment of the antenna system.
  • FIG 9-12 are alternative embodiments of the antenna system according to the invention.
  • FIGs 1 and 2 A simplified illustration of the antenna system 1 according to the invention is given in FIGs 1 and 2.
  • the antenna system has a main antenna 2 for GSM/DCS/PCS and a separate smaller BluetoothTM antenna 3 positioned very close to the main antenna 2.
  • the antennas have a folded distribution which occupies a first plane where most of the antenna pattern is located, a second plane which is perpendicular to the first plane, and a third plane which is perpendicular to the second plane and parallel to the first plane.
  • the main antenna 2 is a built-in patch with parasitic element, whereas the smaller BluetoothTM antenna 3 is a PIFA, however folded a little bit to fit the small space available.
  • the combination of the antennas, their individual positions, and the folding together with the electrical connection are noteworthy features.
  • a significant advantage with the antenna system according to the present invention is the size reduction that obtained by placing the antennas close together as well as the folding of the antenna patterns.
  • the main antenna 2 comprises a dual band PIFA antenna with a- GMS part 4 and a DCS part 5.
  • the main antenna 2 comprises a parasitic PCS part 6.
  • the main an- tenna 2 and the BluetoothTM PIFA antenna 3 are printed on the same flexible substrate (not shown in the drawings) and constitute a common flex film.
  • the metal trace of the parasitic PCS part 6 is located between the main antenna 2 and the BluetoothTM antenna 3. It is resonant at PCS 1900 MHz, about x 4 wavelength, and will function as a high impedance blocking between the main antenna 2 and the BluetoothTM antenna 3.
  • the antenna system 1 has five connection traces 7a-
  • the main antenna 2 has a ground trace 7a ("Ground #1”) and a feed trace 7b ("Feed #1") for the GSM part 4 and the DCS part 5.
  • the parasitic PCS part 6 has only a ground trace 7c ("Ground #2”), whereas the BluetoothTM antenna 3 has a ground trace 7d (“Ground #3) as well as a feed trace 7e (“Feed #2”), as shown in FIG 1.
  • the actual width of the feed traces is a tradeoff between size and performance. By widening the feed traces, a better performance would be achieved. However, wider feed traces result in an increased size of the antenna system.
  • the antenna system 1 is connected to radio circuitry on a printed circuit board 13 (FIG 5) through electrical feeding 8.
  • the electrical feeding 8 is implemented as an antenna connector 11, which is mounted to the printed circuit board 13 and comprises a group of five pogo pins 12 (one for each connection trace 7a-7e) .
  • the flex film with the antenna system 1 is placed on a plastic antenna carrier 9, which will keep the film at its correct position with respect to the printed circuit board 13.
  • FIG 3 illustrates the antenna carrier 9 together with the antenna connector 11 and the primary side of a mobile telephone 10.
  • the material used for the antenna carrier will affect the antenna performance . This is due to that the antenna carrier will act as a dielectric loading, changing the resonance frequencies of the antennas slightly.
  • a lossy material i.e. a material with a large dielectric constant, will give a better NS R (Voltage Standing Wave Ratio) and hence a broader bandwidth, but will at the same time provide a lower antenna gain.
  • the antenna carrier is made of plastic. However, other materials such as ceramic, mica, or glass could also be used as carrier material, depending on the desired working characteristics of the antenna system.
  • FIG 4 illustrates the base of the antenna system 1 unfolded in one plane above the antenna carrier 9.
  • the antenna connector 11 with its pogo pins 12 is shown underneath the antenna carrier 9.
  • FIG 5 illustrates, again, the antenna system 1 unfolded above the antenna connector 11 and the pogo pins 12.
  • the naked printed circuit board 13 is also shown.
  • FIG 6 shows return loss for the main antenna 2 and the BluetoothTM antenna 3. As seen, the antennas are tuned (designed) to work at slightly too high frequencies. This is done in order to compensate for losses that are introduced by the plastic cover and the rest of the mechanics underneath.
  • FIG 7 illustrates the isolation between the two antennas of FIG 6 . Obviously, the isolation is very good, even in the highest band despite the short distance between 1:he antennas .
  • FIG 8 is a dimensioned drawing of the presently preferred embodiment of the antenna system.
  • FIGs 9-12 illustrates four alternative embodiments of the antenna system according to the invention. As can be seen from the figures different parts of the antenna system may look different depending on e.g. the amount of space available inside the portable communication device.

Abstract

A build-in, multi band, multi antenna system (1) for a protable communicaiton device (10) has a first antenna (2, 4, 5), which is resonant in first an second frequency band. A secon antenna (3) is resonant in a fourth frequency bank. The first antenna, the papasitic element and the second antenna are provided on a common flexible substrate.

Description

A BUILT-IN, MULTI BAND, MULTI ANTENNA SYSTEM
Technical Field The present invention relates to mobile telephones and similar types of portable communication devices that need several commercial frequency bands to communicate on . More specifically, the invention relates to a built-in, multi band, multi antenna system for such mobile tele- phones, etc.
Background Art
A basic problem of today is to be able to put one or several very small antennas on e.g. a mobile telephone. Main emphasis is put on size, but a good electrical performance is also important. Now when Bluetooth™ applications have become a world standard, an additional frequency band must be covered in future mobile telephones . It is very- hard to include this in an already existing antenna, most commonly a built-in antenna. Another way is to include a new antenna to handle Bluetooth™ communication. Usually the available space is very small - in fact, too small in reality. The antennas will often have to be located very close to each other, since generally, the best position is at the top of the telephone.
This kind of complicated internal antenna system needs a very sophisticated mechanical process, involving for example MID, metal painting and printed film. The designer must be very careful to get good isolation between the main antenna and the Bluetooth™ antenna .
State of the art today is one single antenna, usually a built-in patch antenna with one grounding and one feeding pin, functioning at two commercial frequency bands: GSM and DCS or- maybe GSM and PCS. No Bluetooth™ antenna has been observed on the market together with such an antenna in a mobile telephone. Thus, the known antennas are only dual band, and a Bluetooth™ antenna is not included.
Summary of the Invention It is an object of the present invention to propose a very compact multi band, multi antenna system, with a cheap and sophisticated mechanical concept to get good isolation by clever design of a parasitic element as a high impedance block. The object of the invention is achieved by an antenna system according to the attached independent patent claim.
Other objects, features and advantages of the present invention will appear from the following detailed disclosure of a preferred embodiment, from the enclosed drawings as well as from the subclaims.-
Brief Description of the Drawings
A presently preferred exemplifying embodiment of an antenna system according to the present invention will now be described in more detail with reference to the accompanying drawings , where :
FIG 1 is a schematic perspective view of the antenna system, FIG 2 is schematic side view of the antenna system shown in FIG 1,
FIG 3 is a schematic perspective view of a mobile telephone with an antenna carrier and an antenna connector for the antenna system of FIGs 1 and 2, FIG 4 corresponds to FIG 3, with the addition of the antenna system of FIGs 1 and 2 in an unfolded condition,
FIG 5 shows the unfolded antenna system of FIG 4 together with the antenna connector mounted on a printed circuit board, FIG 6 is a return loss diagram for a main antenna and a Bluetooth™ antenna, which are comprised in the antenna system,
FIG 7 illustrates the isolation between the two antennas of FIG 6,
FIG 8 is a dimensioned drawing of the presently preferred embodiment of the antenna system, and
FIG 9-12 are alternative embodiments of the antenna system according to the invention.
Detailed Disclosure
A simplified illustration of the antenna system 1 according to the invention is given in FIGs 1 and 2. The antenna system has a main antenna 2 for GSM/DCS/PCS and a separate smaller Bluetooth™ antenna 3 positioned very close to the main antenna 2. As seen in FIG 2 , the antennas have a folded distribution which occupies a first plane where most of the antenna pattern is located, a second plane which is perpendicular to the first plane, and a third plane which is perpendicular to the second plane and parallel to the first plane.
The main antenna 2 is a built-in patch with parasitic element, whereas the smaller Bluetooth™ antenna 3 is a PIFA, however folded a little bit to fit the small space available. The combination of the antennas, their individual positions, and the folding together with the electrical connection are noteworthy features.
A significant advantage with the antenna system according to the present invention is the size reduction that obtained by placing the antennas close together as well as the folding of the antenna patterns.
The main antenna 2 comprises a dual band PIFA antenna with a- GMS part 4 and a DCS part 5. In addition, the main antenna 2 comprises a parasitic PCS part 6. The main an- tenna 2 and the Bluetooth™ PIFA antenna 3 are printed on the same flexible substrate (not shown in the drawings) and constitute a common flex film.
The metal trace of the parasitic PCS part 6 is located between the main antenna 2 and the Bluetooth™ antenna 3. It is resonant at PCS 1900 MHz, about x4 wavelength, and will function as a high impedance blocking between the main antenna 2 and the Bluetooth™ antenna 3.
By arranging the antennas in this manner, it is possible to reduce the overall size of the antenna system compared to if the parasitic element was not present. As can be understood, moving the antennas further apart, which would be necessary in the absence of the parasitic element, would increase the isolation between the main antenna and the BluetoothTM antenna. The antenna system 1 has five connection traces 7a-
7e, which all are located in the third plane. Of these connection traces, the main antenna 2 has a ground trace 7a ("Ground #1") and a feed trace 7b ("Feed #1") for the GSM part 4 and the DCS part 5. The parasitic PCS part 6 has only a ground trace 7c ("Ground #2"), whereas the Bluetooth™ antenna 3 has a ground trace 7d ("Ground #3) as well as a feed trace 7e ("Feed #2"), as shown in FIG 1. The actual width of the feed traces is a tradeoff between size and performance. By widening the feed traces, a better performance would be achieved. However, wider feed traces result in an increased size of the antenna system.
As seen in FIG 2, the antenna system 1 is connected to radio circuitry on a printed circuit board 13 (FIG 5) through electrical feeding 8. As appears from FIGs 3-5, the electrical feeding 8 is implemented as an antenna connector 11, which is mounted to the printed circuit board 13 and comprises a group of five pogo pins 12 (one for each connection trace 7a-7e) .
In a preferred embodiment, the flex film with the antenna system 1 is placed on a plastic antenna carrier 9, which will keep the film at its correct position with respect to the printed circuit board 13. FIG 3 illustrates the antenna carrier 9 together with the antenna connector 11 and the primary side of a mobile telephone 10. The material used for the antenna carrier will affect the antenna performance . This is due to that the antenna carrier will act as a dielectric loading, changing the resonance frequencies of the antennas slightly. A lossy material, i.e. a material with a large dielectric constant, will give a better NS R (Voltage Standing Wave Ratio) and hence a broader bandwidth, but will at the same time provide a lower antenna gain. As mentioned above, in the preferred embodiment the antenna carrier is made of plastic. However, other materials such as ceramic, mica, or glass could also be used as carrier material, depending on the desired working characteristics of the antenna system.
FIG 4 illustrates the base of the antenna system 1 unfolded in one plane above the antenna carrier 9. The antenna connector 11 with its pogo pins 12 is shown underneath the antenna carrier 9.
FIG 5 illustrates, again, the antenna system 1 unfolded above the antenna connector 11 and the pogo pins 12. The naked printed circuit board 13 is also shown.
FIG 6 shows return loss for the main antenna 2 and the Bluetooth™ antenna 3. As seen, the antennas are tuned (designed) to work at slightly too high frequencies. This is done in order to compensate for losses that are introduced by the plastic cover and the rest of the mechanics underneath. FIG 7 illustrates the isolation between the two antennas of FIG 6 . Obviously, the isolation is very good, even in the highest band despite the short distance between 1:he antennas .
FIG 8 is a dimensioned drawing of the presently preferred embodiment of the antenna system. Finally, FIGs 9-12 illustrates four alternative embodiments of the antenna system according to the invention. As can be seen from the figures different parts of the antenna system may look different depending on e.g. the amount of space available inside the portable communication device.
The invention has been described above with reference to a presently preferred embodiment example. However, other embodiments than the one described above as well as many modifications, variations and equivalent arrangements are possible within the scope of the invention, as defined by the appended •independent patent claim.

Claims

1. A built-in, multi band, multi antenna system (1) for a portable communication device (10) , comprising, in combination: a first antenna (2, 4, 5), which is resonant in first and second frequency bands, a parasitic element (6) , which is positioned adjacent to the first antenna and is resonant in a third frequency band, and a second antenna (3) , which is resonant in a fourth frequency band, wherein the first antenna, the parasitic element and the second antenna are provided on a common flexible substrate.
2. An antenna system as in claim 1, wherein the first antenna (2, 4, 5) and the second antenna (3) are PIFA antennas .
3. An antenna system as in claim 2, wherein the first antenna (2, 4, 5) has a first feed trace (7b) and a first ground trace (7a) , the parasitic element (6) has a second ground trace (7c) , and the second antenna (3) has a second feed trace (7e) and a third ground trace (7d) .
4. An antenna system as in claim 3, wherein the first antenna (2, 4, 5) has a GSM part (4) and a DCS part (5) , the parasitic element (6) is operative in the PCS band, and the second antenna (3) is a Bluetooth™ antenna.
5. An antenna system as in any preceding claim, wherein the parasitic element (6) is located between the first antenna (2, 4, 5) and the second antenna (3) so as to provide high impedance blocking between the antennas .
6. An antenna system as in any preceding claim, further comprising an antenna carrier (9) , upon which said common flexible substrate is provided in a folded distribution.
7. A portable communication device (10) having a printed circuit board (13), characterized by an antenna system (1) according to any of claims 1-6, and an antenna connector (11) for connecting the antenna system to the printed circuit board (13).
8. A portable communication device as in claim 7, the antenna system (1) being defined by claim 3, wherein the antenna connector (11) comprises a group of five pogo pins (12) , each of which is aligned with a respective one of said first feed trace (7b) , said first ground trace (7a) , said second ground trace (7c) , said second feed trace (7e) and said third ground trace (7d) .
9 . A portable communication device as in claim 7 or wherein the device is a mobile telephone.
PCT/SE2002/000532 2001-03-23 2002-03-20 A built-in, multi band, multi antenna system WO2002078123A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02708888A EP1378021A1 (en) 2001-03-23 2002-03-20 A built-in, multi band, multi antenna system
US10/472,996 US20040137950A1 (en) 2001-03-23 2002-03-20 Built-in, multi band, multi antenna system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
SE0101067A SE0101067D0 (en) 2001-03-23 2001-03-23 A built-in multi band multi antenna system
SE0101067-7 2001-03-23
US28641201P 2001-04-25 2001-04-25
US60/286,412 2001-04-25
SE0102183A SE518988C2 (en) 2001-03-23 2001-06-20 Built-in multi-band multi-antenna system for mobile telephone has high impedance block placed between two closely situated antennas
SE0102183-1 2001-06-20

Publications (1)

Publication Number Publication Date
WO2002078123A1 true WO2002078123A1 (en) 2002-10-03

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ID=27354677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/000532 WO2002078123A1 (en) 2001-03-23 2002-03-20 A built-in, multi band, multi antenna system

Country Status (3)

Country Link
US (1) US20040137950A1 (en)
EP (1) EP1378021A1 (en)
WO (1) WO2002078123A1 (en)

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